Of the four classical elements, fire is by far the most primal. The most challenging. The most dangerous. The most transforming.
The most visceral.

The most fun.

Seriously, which enemies would cower in their tracks if you appeared in front of them and proclaimed yourself to be a great water wizard?

Transcript

Luke: Okay, I'll help you, I guess. Until we find a blast furnace.Obi-Wan: Very well. We should leave right away. Guess I should cancel my Tatooine Times delivery.R2-D2: You're never coming back, you know. Let's burn your hovel to the ground. That will send the right message.Obi-Wan: Unlike you, I don't believe in burning... bridges.R2-D2: Not even the outhouse?GM: Okay, that's a good place to stop for tonight.R2-D2: What, in the outhouse?Luke: Can't we keep playing? It's not even midnight!Obi-Wan: Uh... can I stay over? I've got my own bedroll.GM: Sure, Ben.C-3PO: What?! You're coming home, aren't you?Obi-Wan: Sally, can you do me a favour? Don't tell mum and dad I'm back.Obi-Wan: I don't want you to have to deal with their questions. I'll talk to them in a couple of days.
{beat}C-3PO: Don't you dare let him out of this house.GM: As long as Pete doesn't set any fires on his way out.